Tuesday, Jan 1, 2013 - 5:00 PM
"Building The Great Cathedrals"
Carved from 100 million pounds of stone, soaring atop a spiderweb of masonry, Gothic cathedrals are marvels of human achievement and artistry. But how did medieval builders reach such spectacular heights? Sometimes taking 100 years to build, these architectural marvels were crafted from just hand tools and stone. Many now teeter on the brink of catastrophic collapse.G